Add traces for main omnibox providers

components/omnibox/browser/bookmark_provider.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/omnibox/browser/bookmark_provider.h"
 
 #include <algorithm>
 #include <functional>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #include "components/bookmarks/browser/bookmark_match.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/autocomplete_result.h"
 #include "components/omnibox/browser/history_provider.h"
 #include "components/omnibox/browser/url_prefix.h"
 #include "components/prefs/pref_service.h"
 #include "components/url_formatter/url_formatter.h"
 #include "url/url_constants.h"
@@ skipping 34 matching lines @@
       client_(client),
       bookmark_model_(NULL) {
   if (client_) {
     bookmark_model_ = client_->GetBookmarkModel();
     languages_ = client_->GetAcceptLanguages();
   }
 }
 
 void BookmarkProvider::Start(const AutocompleteInput& input,
                              bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "BookmarkProvider::Start");
   if (minimal_changes)
     return;
   matches_.clear();
 
   if (input.from_omnibox_focus() || input.text().empty() ||
       (input.type() == metrics::OmniboxInputType::FORCED_QUERY))
     return;
 
   DoAutocomplete(input);
 }
@@ skipping 259 matching lines @@
        i != positions.end();
        ++i) {
     AutocompleteMatch::ACMatchClassifications new_class;
     AutocompleteMatch::ClassifyLocationInString(i->first, i->second - i->first,
         text_length, url_style, &new_class);
     classifications = AutocompleteMatch::MergeClassifications(
         classifications, new_class);
   }
   return classifications;
 }